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This got me wondering how could one prove they were from the future (opposite of being able to bring technology with you) if the Butterfly Effect is real and your return changed things?

Natural disasters? Meteor strikes on planets/moons in the solar system and their time and date?

You can know about meteor strikes without time travel. Natural disasters might also be predictable. It only proves you know something others don't. I don't think that even bringing technology from the future is a very good proof – secret government technological developments and international conspiracies, as crazy as they are, are more likely than time travel.

On the other hand, for predicting the future, the butterfly effect doesn't matter at all. It only spoils major events. If you went to the 19th century, even if, say, World War II didn't happen, you can still predict personal computers, cellphones, television shows, spaceflight, the Internet, same-sex marriage, women wearing trousers, medical advances, universal suffrage, skyscrapers, global warming and HIV. Even if you meddle with history, those will still come true, and predicting them all without pre-knowledge is nearly impossible.

Unless you were visited by aliens and read their history books...

ETA: Go tell Charles Babbage that in the future people will have a differential engine in their pocket dedicated to doing discrete Fourier transforms on the colours of moving pictures of other people's cats they sent you over the wireless telegraph to recreate them for you to watch while you take a doody. Totally unthinkable, yet completely inevitable.

. . . Go tell Charles Babbage that in the future people will have a differential engine in their pocket dedicated to doing discrete Fourier transforms on the colours of moving pictures of other people's cats they sent you over the wireless telegraph to recreate them for you to watch while you take a doody. Totally unthinkable, yet completely inevitable.

Not to mention what the Victorians would have thought of internet porn.

__________________“All the universe or nothingness. Which shall it be, Passworthy? Which shall it be?”

So wait, if TT really does exist would the secret people running it not go forward in time to find all the people who were going to blab about it, then travel back into the past stop them finding out about it in the first place so thay cant blab about it?

Unless he knew they were go do that from when he TT, so he travelled back back and stopped them from travelling back, and this would continue until they went back so far as to remove the fact they somebody made TT possible, then the question would be how did they travel back to make TT impossible.

And with that, Dr Sam Beckett stepped into the Quantum accelerator and turned into banana.

Well, Andrew Basiago says it is impossible to change past events of a specific timeline, and if you tried, you would only be acting as a causal agent in the already established truths about the timeline, since if someone did change the timeline, then we would already be living in the altered timeline. However, Basiago claims that Project Pegasus revealed the existence of multiple quantum realities, therefore changing the past may simply be a matter of acting as a causal agent for events in another timeline.

The guy must be a time-traveler. His website says that his forthcoming book will be published in 2011.

As far as causality and such:

The bad news is that you are slipping through alternate realities continuously.

Remember when you couldn't find your keys the other day? You would swear that you left them right there on the kitchen counter, but they weren't there later. Things is you DId leave them right there on the kitchen counter. Somewhere between leaving the keys there and looking for them, you shifted to an alternate timeline where you actually left the keys over there on the end table next to the couch where you found them.

Just try to roll with this kind of thing, and don't think about it too much. And if you DO remember President Stevenson being elected back in '52, don't waste too much time trying to convince everyone else. they'll just think you're nuts.

The guy must be a time-traveler. His website says that his forthcoming book will be published in 2011.

As far as causality and such:

The bad news is that you are slipping through alternate realities continuously.

Remember when you couldn't find your keys the other day? You would swear that you left them right there on the kitchen counter, but they weren't there later. Things is you DId leave them right there on the kitchen counter. Somewhere between leaving the keys there and looking for them, you shifted to an alternate timeline where you actually left the keys over there on the end table next to the couch where you found them.

Just try to roll with this kind of thing, and don't think about it too much. And if you DO remember President Stevenson being elected back in '52, don't waste too much time trying to convince everyone else. they'll just think you're nuts.